Ocean Circulation and Climate Dynamics

AG01

Agulhas Nest at 1/10°

Global Bathymetry (based on BlueMarble by the NASA Visible Earth Project). Boundaries of the AGRIF nest are shown as yellow frame.

The focus of AG01 is on the ocean circulation around and near the southern tip of South Africa, especially the Agulhas system and its sources and extensions. To resolve mesoscale processes in this region adequately, a 1/10° AGRIF nest is embedded in a global ocean model at 1/2° (ORCA05). The successor configuration, which covers a larger region, is INALT01.

Person in charge: Arne Biastoch

Characteristics

Global
  • NEMO ocean
  • LIM2 sea ice (elastic-viscous rheology)
  • Tripolar ORCA grid
  • Total Grid Points: 37 Mill
Host:
Nest
  • Grid Points: 909 x 474 x 46
  • Typical Grid Point Distance: ~9 km
  • Time Step: 540s

Simulations

The series of simulations with this configuration were completed in 2011. 

  • Climatological control run
  • Hindcast reference experiment (1958-2004)
  • Several sensitivity experiments, e.g. with wind changes

HPC: 

Simulations and numerical experiments with this configuration are mostly done using high performance computing facilities at HLRS.

Data

Data is available only internally. For data requests from outside GEOMAR, please contact the Model and Data Management (see right column).

Projects

  • DFG Agulhas

Publications

Jump to: 2013 | 2012 | 2010 | 2009 | 2008
Number of items: 15.

2013

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Biastoch, A. and Böning, C. W. (2013) Anthropogenic impact on Agulhas leakage Geophysical Research Letters, 40 (6). pp. 1138-1143. DOI 10.1002/grl.50243.

2012

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Lutjeharms, J. R. E., Biastoch, A., Van der Werf, P. M., Ridderinkhof, H. and De Ruijter, W. P. M. (2012) On the discontinuous nature of the Mozambique Current South African Journal of Science, 108 (1/2). DOI 10.4102/sajs.v108i1/2.428.

2010

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van Sebille, E., Beal, L. M. and Biastoch, A. (2010) Sea surface slope as a proxy for Agulhas Current strength Geophysical Research Letters, 37 (9). L09610. DOI 10.1029/2010GL042847.

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van Sebille, E., van Leeuwen, P. J., Biastoch, A. and de Ruijter, W. P. M. (2010) On the fast decay of Agulhas rings Journal of Geophysical Research, 115 (C3). C03010. DOI 10.1029/2009JC005585.

2009

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Biastoch, A., Beal, L., Lutjeharms, J. R. E. and Casal, T. G. D. (2009) Variability and coherence of the Agulhas Undercurrent in a High-resolution Ocean General Circulation Model Journal of Physical Oceanography, 39 . pp. 2417-2435. DOI 10.1175/2009JPO4184.1.

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Biastoch, A., Böning, C. W., Schwarzkopf, F. U. and Lutjeharms, J. R. E. (2009) Increase in Agulhas leakage due to poleward shift of Southern Hemisphere westerlies Nature, 462 . pp. 495-498. DOI 10.1038/nature08519.


Scheinert, M., Biastoch, A. and Böning, C. W. (2009) The Agulhas System as a Prime Example for the Use of Nesting Capabilities in Ocean Modelling In: High Performance Computing on Vector Systems 2009 , ed. by Resch, M., Roller, S., Benkert, K., Galle, M., Bez, W. and Kobayashi, H.. Springer, Berlin, pp. 191-198. ISBN 978-3642039126

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Siedler, G., Rouault, M., Biastoch, A., Backeberg, B., Reason, C. J. C. and Lutjeharms, J. R. E. (2009) Modes of the southern extension of the East Madagascar Current Journal of Geophysical Research - Oceans, 114 . C01005. DOI 10.1029/2008JC004921.

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Unger, F. A. and Biastoch, A. (2009) Improvements for High Resolution Ocean Research with NEMO Interdisciplinary Information Sciences, 15 . pp. 85-90. DOI 10.4036/iis.2009.85.

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Van Sebille, E., van Leeuwen, P. J., Biastoch, A., Barron, C. N. and de Ruijter, W. P. M. (2009) Lagrangian validation of numerical drifter trajectories using drifting buoys: Application to the Agulhas region Ocean Modelling, 29 . pp. 269-276. DOI 10.1016/j.ocemod.2009.05.005.

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van Sebille, E., Barron, C. N., Biastoch, A., van Leeuwen, P. J., Vossepoel, F. C. and de Ruijter, W. P. M. (2009) Relating Agulhas leakage to the Agulhas Current retroflection location Ocean Science, 5 . pp. 511-521. DOI 10.5194/os-5-511-2009.

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van Sebille, E., Biastoch, A., van Leeuwen, P. J. and de Ruijter, W. P. M. (2009) A weaker Agulhas Current leads to more Agulhas leakage Geophysical Research Letters, 36 . L03601. DOI 10.1029/2008GL036614.

2008

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Biastoch, A., Böning, C. W. and Lutjeharms, J. R. E. (2008) Agulhas leakage dynamics affects decadal variability in Atlantic overturning circulation Nature, 456 . pp. 489-492. DOI 10.1038/nature07426.

Biastoch, A., Lütjeharms, J. R. E., Böning, C. W. and Scheinert, M. (2008) Mesoscale perturbations control inter-ocean exchange south of Africa Geophysical Research Letters, 35 . L20602. DOI 10.1029/2008GL035132.


Haine, T., Böning, C. W., Brandt, P., Fischer, J., Funk, A., Kieke, D., Kvaleberg, E., Rhein, M. and Visbeck, M. (2008) North Atlantic Deep Water Formation in the Labrador Sea, Recirculation through the Subpolar Gyre, and Discharge to the Subtropics In: Arctic-Subarctic Ocean Fluxes, Defining the Role of the Northern Seas in Climate , ed. by Dicksen, R. R., Meincke, J. and Rhines, P.. Springer, Dordrecht, pp. 653-702. ISBN 978-1-4020-6773-0

This list was generated on Tue Apr 25 04:55:47 2017 CEST.

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Model and Data Management

For general questions about the model configurations and data access, please contact:

Dr. Markus Scheinert
West Shore Building
Room 427
Phone: 0431 600-4014
email: mscheinert(at)geomar.de

Dr. Klaus Getzlaff
West Shore - Alte Botanik
Room 51
Phone: 0431 600-4179
email: kgetzlaff(at)geomar.de